<template>
  <div id="app">
    <router-view></router-view>
  </div>
</template>

<script>
export default {

  data () {
    return {
     
    }
  },
   created () {
    //在页面加载时读取sessionStorage里的状态信息
    if (sessionStorage.getItem("store") ) {
        this.$store.replaceState(Object.assign({}, this.$store.state,JSON.parse(sessionStorage.getItem("store"))))
    } 

    //在页面刷新时将vuex里的信息保存到sessionStorage里
    window.addEventListener("beforeunload",()=>{
        sessionStorage.setItem("store",JSON.stringify(this.$store.state))
    })
  }
}
</script>

<style>

</style>